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Bartholin's cyst

A Bartholin's cyst, also called a Bartholin's duct cyst, is a small fluid-filled sac just inside the opening of a woman's vagina.
Symptoms of a Bartholin's cyst
Most Bartholin's cysts do not cause any symptoms. However, there may be a soft, painless lump in the labia (the two pairs of lips at the entrance of the vagina).
Causes of a Bartholin's cyst
A Bartholin's cyst is caused by an obstruction that blocks the tube, known as a duct, leading from the Bartholin's gland into the vagina.
Treating a Bartholin's cyst
If a Bartholin's cyst is small and does not cause any symptoms, it's often better to leave it alone. However, you should still see your GP if you notice a lump.